Looking up init data for regulators found on chips is a common operation
that can be handled in a generic way. The new helper function introduced
by this patch looks up the children of a given node by names specified
in a match table and fills that match table with information parsed from
the DT.
This is based on work by Rhyland Klein <rkl...@nvidia.com>.
Signed-off-by: Thierry Reding <thierry.red...@avionic-design.de>
---
drivers/regulator/of_regulator.c | 47 ++++++++++++++++++++++++++++++++
include/linux/regulator/of_regulator.h | 18 ++++++++++++
2 files changed, 65 insertions(+)
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 679734d..56593b7 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
static void of_get_regulation_constraints(struct device_node *np,
struct regulator_init_data **init_data)
@@ -85,3 +86,49 @@ struct regulator_init_data
*of_get_regulator_init_data(struct device *dev,
return init_data;
}
EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
+
+/**
+ * of_regulator_match - extract regulator init data
+ * @dev: device requesting the data
+ * @node: parent device node of the regulators
+ * @matches: match table for the regulators
+ * @num_matches: number of entries in match table
+ *
+ * This function uses a match table specified by the regulator driver and
+ * looks up the corresponding init data in the device tree. Note that the
+ * match table is modified in place.
+ *
+ * Returns the number of matches found or a negative error code on failure.
+ */
+int of_regulator_match(struct device *dev, struct device_node *node,
+ struct of_regulator_match *matches,
+ unsigned int num_matches)
+{
+ unsigned int count = 0;
+ unsigned int i;
+
+ if (!dev || !node)
+ return -EINVAL;
+
+ for (i = 0; i < num_matches; i++) {
+ struct of_regulator_match *match = &matches[i];
+ struct device_node *child;
+
+ child = of_find_node_by_name(node, match->name);
+ if (!child)
+ continue;
+
+ match->init_data = of_get_regulator_init_data(dev, child);
+ if (!match->init_data) {
+ dev_err(dev, "failed to parse DT for regulator %s\n",
+ child->name);
+ return -EINVAL;
+ }
+
+ match->of_node = child;
+ count++;
+ }
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(of_regulator_match);
diff --git a/include/linux/regulator/of_regulator.h
b/include/linux/regulator/of_regulator.h
index 769704f..f921796 100644
--- a/include/linux/regulator/of_regulator.h
+++ b/include/linux/regulator/of_regulator.h
@@ -6,10 +6,20 @@
#ifndef __LINUX_OF_REG_H
#define __LINUX_OF_REG_H
+struct of_regulator_match {
+ const char *name;
+ void *driver_data;
+ struct regulator_init_data *init_data;
+ struct device_node *of_node;
+};
+
#if defined(CONFIG_OF)
extern struct regulator_init_data
*of_get_regulator_init_data(struct device *dev,
struct device_node *node);
+extern int of_regulator_match(struct device *dev, struct device_node *node,
+ struct of_regulator_match *matches,
+ unsigned int num_matches);
#else
static inline struct regulator_init_data
*of_get_regulator_init_data(struct device *dev,
@@ -17,6 +27,14 @@ static inline struct regulator_init_data
{
return NULL;
}
+
+static inline int of_regulator_match(struct device *dev,
+ struct device_node *node,
+ struct of_regulator_match *matches,
+ unsigned int num_matches)
+{
+ return 0;
+}
#endif /* CONFIG_OF */
#endif /* __LINUX_OF_REG_H */
--
1.7.10
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